adjust suppress for uninit error from visitStack

TBR=ager@chromium.org
BUG=340752
TEST=waterfall

Review URL: https://codereview.chromium.org/226613009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@263030 0039d316-1c4b-4281-b951-d872f2087c98

tools/valgrind/memcheck/suppressions.txt

@@ -6188,7 +6188,7 @@
    fun:_ZN7WebCore11ThreadState10visitStackEPNS_7VisitorE
    fun:_ZN7WebCore11ThreadState5traceEPNS_7VisitorE
    fun:_ZN7WebCore11ThreadState10visitRootsEPNS_7VisitorE
-   fun:_ZN7WebCore4Heap14collectGarbageENS_11ThreadState10StackStateENS0_6GCTypeE
+   fun:_ZN7WebCore4Heap14collectGarbageENS_11ThreadState10StackState*
 }
 {
    bug_345432